Alert archive / Arizona / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 137, NWS Flagstaff, AZ

August 13, 2018Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 13, 2018, 6:53 PM MST for Apache County, Arizona. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 13, 2018, 6:53 PM MST (01:53 UTC)
Expired: Aug 13, 2018, 7:15 PM MST
In force: 22 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Apache County, AZ

The radar

The Flagstaff radar (KFSX), 181 km from the middle of the area, began a volume at 01:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 13, 6:44 PM MST, 9 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
644 PM MST MON AUG 13 2018

AZZ013-014-140230-
Little Colorado River Valley in Navajo County-Little Colorado River
Valley in Apache County-
644 PM MST MON AUG 13 2018

...SIGNIFICANT WEATHER ADVISORY FOR APACHE AND NAVAJO COUNTIES UNTIL
730 PM MST...

At 640 PM MST, Doppler radar was tracking a line of strong
thunderstorms extending from near St. Johns to Woodruff. This line
of storms was moving south at 10 mile per hour.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
St. Johns, Hunt, Concho, Lyman Lake State Park and Lyman Lake as
well as Highway-180.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3462 10959 3449 10931 3437 10927 3435 10938
      3436 10945 3441 10962 3449 10980 3458 11002
      3478 11006 3478 10998 3474 10974
TIME...MOT...LOC 0140Z 033DEG 2KT 3462 10972

McCollum

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 13, 5:15 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Aug 13, 6:44 PM MST	Special Weather Statement	FGZ		46 min
Aug 13, 7:06 PM MST	Special Weather Statement	FGZ		24 min
Aug 13, 7:23 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	37 min
Aug 13, 7:42 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	33 min
Aug 13, 8:14 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	31 min
Aug 13, 8:22 PM MST	Severe Thunderstorm Warning	FGZ	Apache	23 min
Aug 14, 12:06 PM MST	Special Weather Statement	FGZ		24 min
Aug 14, 1:31 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	20 min
Aug 14, 1:37 PM MST	Special Weather Statement	FGZ	Yavapai	23 min
Aug 14, 2:40 PM MST	Special Weather Statement	FGZ		35 min
Aug 14, 2:51 PM MST	Special Weather Statement	FGZ		24 min
Aug 14, 3:02 PM MST	Areal Flood Advisory	FGZ	Coconino	118 min
Aug 14, 3:40 PM MST	Areal Flood Advisory	FGZ	Gila	3 hr
Aug 14, 3:47 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	28 min
Aug 14, 4:01 PM MST	Severe Thunderstorm Warning	FGZ	Gila	22 min
Aug 14, 4:58 PM MST	Special Weather Statement	FGZ		32 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2018 Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.